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Highly Active Sulfided NiPMo Hydrodesulfurization Catalyst Prepared from Keggin-type Phosphomolybdic Acid
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作者 Zhu Tianhan Li Wenxu +2 位作者 Wang Haiyong Wang Chenguang Yang Bin 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2023年第1期133-143,共11页
A highly active sulfided NiPMo/MCM-41(NiPMo-S/M41)hydrodesulfurization(HDS)catalyst was successfully synthesized using Keggin-type phosphomolybdic acid as the phosphorus and molybdenum source and thioacetamide as the ... A highly active sulfided NiPMo/MCM-41(NiPMo-S/M41)hydrodesulfurization(HDS)catalyst was successfully synthesized using Keggin-type phosphomolybdic acid as the phosphorus and molybdenum source and thioacetamide as the sulfur source.The supported catalysts NiPMo/M41,Ni_(2)P-Mo/M41,and Ni_(2)P/M41 were also prepared to investigate the effects of Mo,S,and the Keggin structure on the HDS performance.The HDS activities of NiPMo/M41 and NiPMo-S/M41 toward dibenzothiophene were much higher than that of Ni_(2)P-Mo/M41,demonstrating that the active phases in the Keggin-structured catalysts were significantly superior to the Mo-modified Ni_(2)P phase.The HDS activities of the catalysts followed the order NiPMo-S/M41(96.7%)>NiPMo/M41(89.9%)>Ni_(2)P-Mo/M41(53.5%)>Ni_(2)P/M41(48.9%).For Ni_(2)P/M41,Ni_(2)P-Mo/M41,and NiPMo/M41,cyclohexylbenzene(CHB)was formed in low concentrations(<21.0%),indicating that direct desulfurization was the favored reaction route and that this did not change for Keggin-structured NiPMo/M41.By contrast,the CHB selectivity of NiPMo-S/M41 increased to 44.6%,much higher than that of NiPMo/M41(17.6%),demonstrating that sulfidation enhanced the hydrogenation ability,which was ascribed to a metal-acid synergistic effect. 展开更多
关键词 keggin-type phosphomolybdic acid HYDRODESULFURIZATION DIBENZOTHIOPHENE
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Oxidation of propane over substituted Keggin phosphomolybdate salts 被引量:4
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作者 T.Mazari C.Roch.Marchal +2 位作者 S.Hocine N.Salhi C.Rabia 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2009年第3期319-324,共6页
Ammonium salts, (NH4)6HPMo11MO40 (M = Ni, Co, Fe), have been investigated for the oxidation of propane, with molecular oxygen, at temperature ranging between 380 ℃ and 420 ℃ after in-situ pre-treatment performed... Ammonium salts, (NH4)6HPMo11MO40 (M = Ni, Co, Fe), have been investigated for the oxidation of propane, with molecular oxygen, at temperature ranging between 380 ℃ and 420 ℃ after in-situ pre-treatment performed at two heating rate of 5 or 9 ℃/min. They were characterized by BET method, XRD, 31p NMR, UV-Vis and IR techniques. The catalysts were found active in the propane oxidation and selective to propene or acrolein, in particular for samples pre-treated with the heating rate of 9 ℃/min. 展开更多
关键词 propane oxidation PROPENE ACROLEIN POLYOXOMETALATES phosphomolybdate
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Oxidation of propane over ammonium-transition metal mixed keggin phosphomolybdate salts 被引量:3
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作者 T. Mazari C. Roch. Marchal +2 位作者 S. Hocine N. Salhi C. Rabia 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2010年第1期54-60,共7页
Mixed ammonium-transition metal salts with formula of (NH4)xMyHzPMo12O40 (M = Ni^2+, Co^2+ or Fe ^3+) denoted as MPMo12 have been investigated for the oxidation of propane, with molecular oxygen, at temperature... Mixed ammonium-transition metal salts with formula of (NH4)xMyHzPMo12O40 (M = Ni^2+, Co^2+ or Fe ^3+) denoted as MPMo12 have been investigated for the oxidation of propane, with molecular oxygen, at temperature range between 380 ℃ and 420 ℃ after in-situ pre-treatment performed at two heating rate of 5 or 9℃/min. They were characterized by BET method, XRD, UV-Vis and IR techniques. The catalysts were found to be active in the propane oxidation and selective to propene or acrolein, in particular for samples pre-treated with the heating rate of 9℃/min. FePMo12 was found to be a more active catalyst for propene (17.2% yield) with minimal over deep oxidation (0.3% yield in COx). 展开更多
关键词 phosphomolybdate AMMONIUM KEGGIN PROPANE OXIDATION propene ACROLEIN
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Hydrothermal Synthesis, Crystal Structure and Property of a Novel Inorganic-organic Hybrid Compound Based on Phosphomolybdate Anion [H-IDP]_4[PMo_(12)O_(40)]·8H_2O (IDP = 4-(Imidazole-1-yl)phenol) 被引量:1
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作者 周艳红 张宏 +2 位作者 关丽 崔术新 逄媛媛 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2009年第1期72-76,共5页
A novel compound [H-IDP]4[PMo12O40]·8H2O 1 based on Keggin-type phosphor- molybdate has been synthesized by hydrothermal method and characterized by IR spectroscopy, elemental analyses and single-crystal X-ray di... A novel compound [H-IDP]4[PMo12O40]·8H2O 1 based on Keggin-type phosphor- molybdate has been synthesized by hydrothermal method and characterized by IR spectroscopy, elemental analyses and single-crystal X-ray diffraction. The composite crystallizes in the mono- clinic system, space group C2/m with a = 13.937(5), b = 27.033(5), c = 10.857(5) A, β = 122.489(5)°, V = 3450(2)A^3, Mr = 2611.11, Z = 2, Dc = 2.498 g/cm^3, F(000) = 2486,μ = 2.243 mm^-1, the final R = 0.0568 and wR = 0.1216 for 2707 observed reflections with I 〉 2σ(I). X-ray structural study shows that 1 consists of a [PMo12O40]^4- polyanion, four protonated IDP cations and eight H2O molecules. In the structure of 1, a 3D network forms by hydrogen bond of [PMo12O40]^4- polyanion, HIDP^+ cation and H2O molecules. Upon excitation wavelength of 280 nrn in hydroxylic solvents at room temperature, 1 shows fluorescence property. 展开更多
关键词 hydrothermal synthesis phosphomolybdate 3D network
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Thermal Behaviour of Some New Polyoxometalate Complexes of Ciprofloxacin with Keggin-type Heteropoly Acids 被引量:1
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作者 WANGDun-jia FANGZheng-dong HANDe-yan 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第3期258-263,共6页
Four polyoxometalate complexes, (CPFX·HCl)_3H_4SiW_~12 O_~40 , (CPFX·HCl)_3H_3PW_~12 O_~40 , (CPFX·HCl)_3H_3PMo_~12 O_~40 and (CPFX·HCl)_4H_4SiMo_~12 O_~40 , were prepared from ciprofloxacin hydroc... Four polyoxometalate complexes, (CPFX·HCl)_3H_4SiW_~12 O_~40 , (CPFX·HCl)_3H_3PW_~12 O_~40 , (CPFX·HCl)_3H_3PMo_~12 O_~40 and (CPFX·HCl)_4H_4SiMo_~12 O_~40 , were prepared from ciprofloxacin hydrochloride(CPFX·HCl) reacting with H_nXM_~12 O_~40 ·nH_2O(X=P,Si; M=W,Mo) in an aqueous solution, and characterized by elemental analysis, IR spectrometry and TG-DTA. The IR spectrum confirms the presence of Keggin-type anions of heteropoly acids and the characteristic functional groups of ciprofloxacin. The TG/DTA curves show that their thermal decomposition is a multi-step process including simultaneous collapse of the Keggin-type structure. At first, these compounds had a mass loss of water molecules, then several other mass losses occured due to the decomposition of ciprofloxacin hydrochloride and its fragments with the degradation of Keggin anions. The end product of decomposition is the mixture of WO_3(or MoO_3) and SiO_2(or P_2O_5), identified by X-ray diffraction and IR spectroscopy. The possible thermal decomposition mechanisms of these complexes are proposed. This study exemplified that the thermal stability of the complexes containing tungsten is much better than that of the complexes containing molybdenum. 展开更多
关键词 Thermal decomposition Polyoxometalate complexes keggin-type heteropoly acids Ciprofloxacin hydrochloride TG/DTA
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Hydroisomerization of n-heptane on Pt promoted phosphomolybdate catalysts
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作者 Kanaparthi Ramesh Siti Norhayati Rubab Shabaz Khan Chilukoti Srilakshmi LIU Yan 《Journal of Chemistry and Chemical Engineering》 2009年第1期36-43,共8页
Phospbomolybdate (PMo) with varying Mo loadings ranging from 5-30 wt% on alumina were prepared by incipient wetness impregnation method. 0.5 wt% of Pt was further loaded in order to prepare the bifunctional (metal-... Phospbomolybdate (PMo) with varying Mo loadings ranging from 5-30 wt% on alumina were prepared by incipient wetness impregnation method. 0.5 wt% of Pt was further loaded in order to prepare the bifunctional (metal-acid) Pt-PMo/Al2O3 catalysts. Thus prepared catalysts showed very high catalytic activities for n-heptane hydroisomerization compared with Pt impregnated MoO3 catalysts supported either on Al2O3 or on AIPO4. The conversion of n-heptane increased with Mo loading up to 20 wt% and slightly decreased with further Mo loading. However, the selectivity towards isomers showed an increasing trend up to 30 wt% of Mo in the catalyst. A relationship between catalytic activity and acidic strength was established in the present study. 展开更多
关键词 phosphomolybdate PT HYDROISOMERIZATION N-HEPTANE
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Syntheses and Properties of Two Complexes Based on Keggin-type Polyoxometalate
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作者 刘春波 王倩倩 +3 位作者 白红叶 车广波 张青 李春香 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2013年第11期1625-1632,共8页
Two unusual complexes [Cda(Do)4(H2O)2CI](PW12O4O)'2H2O (1) and [Aga(Do)6(PW12O40)][Ag(Do)2]2(PW12O4O)'2H2O (2) were hydrothermally synthesized by the combination of two different metallic salts, Ke... Two unusual complexes [Cda(Do)4(H2O)2CI](PW12O4O)'2H2O (1) and [Aga(Do)6(PW12O40)][Ag(Do)2]2(PW12O4O)'2H2O (2) were hydrothermally synthesized by the combination of two different metallic salts, Keggin-type polyoxometalate and 1,10-phen-5,6-dione (Do), and characterized by elemental analyses, inductively coupled plasma analyses, infrared spectra, X-ray photoelectron spectroscopy, thermal gravimetry, photoluminescent spectra and single-crystal X-ray diffraction analyses. Crystal 1 is of monoclinic, space group P21/n with a = 12.383(3), b = 18.326(4), c = 16.437(3) A, β = 90.29(3)°, V = 3730.1(13) A3, Z = 2, CdzCasH32NsC1052PW12, Mr. = 4050.24, Dc = 3.604 g'cm-3,μ(MoKa) = 19.145 mm1, F(000) = 3608, GOOF = 1.168, the final R = 0.0569 and wR = 0.0745 for 5715 observed reflections (1 〉 2σ(I)). Crystal 2 is of triclinic, space group Pi with a = 13.959(5), b = 16.972(5), c = 17.647(5)A, α = 85.970(5), β = 81.353(5), γ = 86.316(5)°, V = 4117(2) A3 Z = 1, Ag6C120H64N200102P2W24, Mr. = 8539.47, Dc = 3.444 g-cm-3,μ(MoKa) = 17.511 mm-1, F(000) = 3828, GOOF = 1.033, the final R = 0.0981 and wR = 0.1658 for 9906 observed reflections (I 〉 2σ(I)). Structural analyses show that complex 1 has a zero dimensional structure, which is further assembled into a one-dimensional ladder-like structure through hydrogen bonds. Complex 2 possesses a one-dimensional chain structure. Furthermore, solid-state luminescent spectra of complexes 1 and 2 indicate red and green fluorescent emission, respectively. 展开更多
关键词 keggin-type polyoxometalate 1 10-phenanthroline-5 6-dione crystal structure photoluminescence
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Ultra-deep oxidative desulfurization of fuel with H_2O_2 catalyzed by phosphomolybdic acid supported on silica 被引量:8
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作者 田永胜 王光辉 +3 位作者 龙娟 崔佳伟 金伟 曾丹林 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第12期2098-2105,共8页
A highly active catalyst of phosphomolybdic acid ~HPMo) was prepared and applied in the catalytic oxidative desulfurization (CODS) system. The catalyst was characterized by FT-IR, XRD, XPS and superconducting NMR. ... A highly active catalyst of phosphomolybdic acid ~HPMo) was prepared and applied in the catalytic oxidative desulfurization (CODS) system. The catalyst was characterized by FT-IR, XRD, XPS and superconducting NMR. The influences of rn(catalyst)/m(oil), V(H202)fV(oil), reaction temperature and reaction time on the fractional conversion of benzothiophene (BT) and dibenzothiophene (DBT) were investigated. GC-MS and micra-coulometric methods were employed to investigate the reaction. The catalyst has high desulfurization activity in the removal of BT and DBT under mild conditions. The recycling experiments indicated that DBT and BT removal could still reach 95.2% and 95.7% after 10 cycles. 展开更多
关键词 Mesoporous silica phosphomolybdic acid Oxidative desulfurization Benzothiophene Dibenzothiophene
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纤维素一步法制备乙醇酸工艺优化
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作者 李秀峥 白富栋 +3 位作者 孙启梅 张雷 白毓黎 王鹏翔 《现代化工》 CAS CSCD 北大核心 2024年第S01期280-283,共4页
采用纤维素一步法制备了乙醇酸,分别考察了催化剂种类、催化剂用量、反应温度、反应时间、初始O_(2)压力对纤维素制备乙醇酸反应的影响;利用液相色谱法对产物中乙醇酸含量进行了表征。研究发现,当微晶纤维素用量为0.5 g、磷钼酸水合物... 采用纤维素一步法制备了乙醇酸,分别考察了催化剂种类、催化剂用量、反应温度、反应时间、初始O_(2)压力对纤维素制备乙醇酸反应的影响;利用液相色谱法对产物中乙醇酸含量进行了表征。研究发现,当微晶纤维素用量为0.5 g、磷钼酸水合物催化剂用量为1.05 mmol、H2O用量为50 mL、初始O_(2)压力为0.2 MPa、反应温度为180℃、反应时间为1 h时,乙醇酸收率最高,达到47.0%。 展开更多
关键词 乙醇酸 纤维素 磷钼酸水合物 可降解 单体 合成工艺
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磷钼酸-还原氧化石墨烯-聚苯胺改性阳极微生物燃料电池处理高氯酸盐废水的性能研究
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作者 杨佳琪 廉静 +3 位作者 赵娟 岳琳 郭延凯 郭金燕 《环境污染与防治》 CAS CSCD 北大核心 2024年第7期933-940,共8页
采用磷钼酸(PMo12)-还原氧化石墨烯(rGO)-聚苯胺(PAN)对微生物燃料电池(MFC)的阳极进行改性,构建单室空气阴极MFC,考察了材料结构、改性阳极形貌和MFC的电化学特性、产电特性和高氯酸盐去除性能,并探讨了改善MFC性能的机理。结果表明:... 采用磷钼酸(PMo12)-还原氧化石墨烯(rGO)-聚苯胺(PAN)对微生物燃料电池(MFC)的阳极进行改性,构建单室空气阴极MFC,考察了材料结构、改性阳极形貌和MFC的电化学特性、产电特性和高氯酸盐去除性能,并探讨了改善MFC性能的机理。结果表明:相比空白阳极,PMo12-rGO-PAN改性阳极具有更多的电化学活性位点,其MFC循环伏安闭合曲线面积和交换电流密度分别提高了2.34、9.36倍,电荷转移内阻降低了85.87%。在560 mg/L高氯酸盐下,该阳极MFC产生最大输出电压为160.03 mV;在运行过程中,该阳极MFC对高氯酸盐的还原率始终高于空白阳极。该阳极通过改善微生物的附着条件和提高阳极电子转移速率提升了MFC的运行性能。 展开更多
关键词 磷钼酸 还原氧化石墨烯 聚苯胺 微生物燃料电池 阳极 高氯酸盐 产电
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HPMo/SiO_(2)/Ni催化剂的合成及催化氧化脱硫研究
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作者 孙方力 闫锋 +1 位作者 吴田甜 刘宇新 《现代化工》 CAS CSCD 北大核心 2024年第8期135-139,共5页
合成了一种介孔二氧化硅负载磷钼酸(HPMo/SiO_(2))并掺杂金属镍的固体催化剂,利用XRD、FT-IR和BET对其进行表征。在对模拟汽油的催化氧化脱硫过程中,考察了催化剂质量、反应时间、反应温度以及Ni负载量、萃取时间、氧硫摩尔比等因素对... 合成了一种介孔二氧化硅负载磷钼酸(HPMo/SiO_(2))并掺杂金属镍的固体催化剂,利用XRD、FT-IR和BET对其进行表征。在对模拟汽油的催化氧化脱硫过程中,考察了催化剂质量、反应时间、反应温度以及Ni负载量、萃取时间、氧硫摩尔比等因素对脱硫性能的影响。结果表明,当金属负载量为30%、反应时间为70 min、反应温度为60℃、催化剂质量为0.2 g、氧硫摩尔比为1∶10、萃取时间为10 min时,脱硫率可达到90%以上。该催化剂具有良好的循环使用能力,回收利用4次后,脱硫率仍能达到85%以上。 展开更多
关键词 磷钼酸 催化氧化 模拟汽油 脱硫 循环使用
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聚乙烯醇基磷钼酸铵刺激响应防伪油墨的制备及性能研究
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作者 贾儒林 李宏达 《化学研究与应用》 CAS 北大核心 2024年第8期1888-1895,共8页
选取颜料为磷钼酸铵,连结料为聚乙烯醇,助剂为乙醇和乙二醇,一锅法制备了磷钼酸铵刺激响应防伪油墨。使用单因素优选实验法测试了黏度、初干性、变色灵敏度等因素,确定了磷钼酸铵刺激响应防伪油墨的最佳配比。根据国家标准方法对制备的... 选取颜料为磷钼酸铵,连结料为聚乙烯醇,助剂为乙醇和乙二醇,一锅法制备了磷钼酸铵刺激响应防伪油墨。使用单因素优选实验法测试了黏度、初干性、变色灵敏度等因素,确定了磷钼酸铵刺激响应防伪油墨的最佳配比。根据国家标准方法对制备的防伪油墨进行耐性测试,发现所制备油墨耐性优良,符合国家标准。最后,对磷钼酸铵刺激响应防伪油墨应用能力进行了探讨,油墨墨迹在日光照射下会产生明显的颜色变化,可以应用于商品防伪、文件防伪等领域。 展开更多
关键词 防伪油墨 刺激响应 磷钼酸铵 聚乙烯醇 颜色变化
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氨基功能化SiO_(2)负载磷钼酸催化氧化碘离子性能研究
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作者 卢林 郭军 +2 位作者 张丹 邱双艳 张以菊 《功能材料》 CAS CSCD 北大核心 2024年第10期10142-10150,共9页
将Cu取代的磷钼酸(PMo_(12))通过静电作用锚定在氨基功能化的SiO_(2)(NH_(2)-SiO_(2))表面,制备出非均相催化剂PMo_(11)Cu/NH_(2)-SiO_(2)。运用PXRD(X射线粉末衍射)、FT-IR(傅里叶变换红外光谱)、UV-Vis DRS(紫外-可见漫反射光谱)、SEM... 将Cu取代的磷钼酸(PMo_(12))通过静电作用锚定在氨基功能化的SiO_(2)(NH_(2)-SiO_(2))表面,制备出非均相催化剂PMo_(11)Cu/NH_(2)-SiO_(2)。运用PXRD(X射线粉末衍射)、FT-IR(傅里叶变换红外光谱)、UV-Vis DRS(紫外-可见漫反射光谱)、SEM(扫描电子显微镜)、EDX(X射线能谱仪)和XPS(X射线光电子能谱)等对该催化剂的结构和组成进行表征;探索了其催化过氧化氢(H_(2)O_(2))氧化碘离子(I^(-))性能,结果表明,在T=25℃,c(I^(-))=2.5×10^(-3)mol/L,c(H_(2)O_(2))=2.0×10^(-3)mol/L,pH=2.4,PMo_(11)Cu/NH_(2)-SiO_(2)催化碘离子反应速率v=8.87×10^(-6)mol/L·s,比空白实验提高了616倍,且在前10次循环中都能保持优异的催化活性和稳定性。 展开更多
关键词 过渡金属取代磷钼酸 改性SiO_(2) 非均相催化 碘离子
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Rare earth inorganic-organic hybrid compounds based on Keggin-type polyoxometalate {SiW_(12)} with fast-responsive photochromism and switchable luminescence properties
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作者 Hong Cui Yanli Yang +4 位作者 Xue Bai Xu Han Wensha Zhang Ying Lu Shuxia Liu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2024年第2期286-292,I0003,共8页
Four rare earth inorganic-organic hybrid compounds based on Keggin-type polyoxometalate {SiW_(12)}with general formula [{RE(DMF)_(4)(H_(2)O)_4RE(DMF)_(6)}_(2){SiW_(12)O_(40)}_(3)](RE = La(1),Pr(2),Sm(3),Eu(4),DMF=N,N-... Four rare earth inorganic-organic hybrid compounds based on Keggin-type polyoxometalate {SiW_(12)}with general formula [{RE(DMF)_(4)(H_(2)O)_4RE(DMF)_(6)}_(2){SiW_(12)O_(40)}_(3)](RE = La(1),Pr(2),Sm(3),Eu(4),DMF=N,N-dimethylformamide) were synthesized by the conventional solution method.Structure analyses indicate that four compounds are isostructural and are all built from three [SiW_(12)O_(40)]^(4-) polyoxoanions and DMF ligands linked by RE^(3+).Compounds 1-4 are extremely sensitive to UV light and present excellent photochromic properties,in which the coloring and fading time of samples are both no more than 2 min,and the reversible coloring-fading process can be repeated for at least 10 cycles with little fatigue,suggesting that compounds 1-4 can be a series of fast-responsive and durable photochromic materials.Moreover,the solid-state photoluminescence spectra of compounds 3(Sm) and 4(Eu)display strong characteristic emissions of rare earth ions based on f-f transitions.Meanwhile,compound4(Eu) has a longer fluorescence lifetime up to 566.74 μs.Notably,co mpounds 3(Sm) and 4(Eu) exhibit the switchable luminescence behavior induced by photochromism,which allows them to be used as potential molecular switches. 展开更多
关键词 Inorganic-organic hybrid keggin-type polyoxometalates Rare earths PHOTOCHROMISM Photoluminescence
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Insight into the Alkali Resistance Mechanism of CoMnHPMo Catalyst for NH_(3) Selective Catalytic Reduction of NO
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作者 Kaixin Wang Yunchong Wang +3 位作者 Zongxiang Yang Xinyue Wang Caixia Liu Qingling Liu 《Transactions of Tianjin University》 EI CAS 2024年第4期324-336,共13页
The existence of alkali metals in fl ue gases originating from stationary sources can result in catalyst deactivation in the low-temperature selective catalytic reduction(SCR)of nitrogen oxides(NO_(x)).It is widely ac... The existence of alkali metals in fl ue gases originating from stationary sources can result in catalyst deactivation in the low-temperature selective catalytic reduction(SCR)of nitrogen oxides(NO_(x)).It is widely accepted that alkali metal poisoning causes damage to the acidic sites of catalysts.Therefore,in this study,a series of CoMn catalysts doped with heteropolyacids(HPAs)were prepared using the coprecipitation method.Among these,CoMnHPMo exhibited superior catalytic performance for SCR and over 95%NO_(x) conversion at 150-300.Moreover,it exhibited excellent catalytic activity and stability after alkali poisoning,demonstrating outstanding alkali metal resistance.The characterization indicated that HPMo increased the specifi c surface area of the catalyst,which provided abundant adsorption sites for NO_(x) and NH_(3).Comparing catalysts before and after poisoning,CoMnHPMo enhanced its alkali metal resistance by sacrifi cing Brønsted acid sites to protect its Lewis acid sites.In situ DRIFTS was used to study the reaction pathways of the catalysts.The results showed that CoMnHPMo maintained high NH_(3) adsorption capacity after K poisoning and then reacted rapidly with NO intermediates to ensure that the active sites were not covered.Consequently,SCR performance was ensured even after alkali metal poisoning.In sum-mary,this research proposed a simple method for the design of an alkali-resistant NH_(3)-SCR catalyst with high activity at low temperatures. 展开更多
关键词 NH3-SCR Alkali resistance phosphomolybdic acid CoMn
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Synthesis of Pt/PMA-MIL-101 Catalyst and Its Performance in n-Heptane Isomerization
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作者 Zhang Wei Guo Qiang +5 位作者 Wang Yingjun Suo Yanhua Lin Wenqiu Hu Tengyu Li Tong Liu Shetian 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2024年第3期63-72,共10页
Hydroisomerization of n-heptane is an efficient method for producing gasoline with a high octane number.The focus of this study was to find a highly efficient catalyst that could both promote the conversion of n-hepta... Hydroisomerization of n-heptane is an efficient method for producing gasoline with a high octane number.The focus of this study was to find a highly efficient catalyst that could both promote the conversion of n-heptane and inhibit the cracking side reaction.MIL-101(Cr)is a chromium-based metal-organic framework(MOF)with good hydrothermal stability,and exhibits a three-dimensional pore structure that is similar to that of zeolites.Using phosphomolybdic acid(PMA;H3PMo12O40·xH2O)can increase the number of Brønsted acid sites on MIL-101(Cr),which contributes to improving the catalytic performance during isomerization.In this study,0.4%Pt/PMA-MIL-101(Cr)catalyst was successfully crystallized at 220℃using a hydrothermal synthetic method.The results showed that the synthesized samples were mesoporousmicroporous composite materials with the typical octahedral structure,and the MIL-101(Cr)framework was not damaged following modification with PMA.It was found that 0.4%Pt30%PMA-MIL-101(Cr)exhibited the best performance for isomerization of n-heptane,with a conversion rate and selectivity at 260°C of 47.6%and 96.6%,respectively.After five hours of reaction,the conversion rate and selectivity of the catalyst remained above 38%and 80%,respectively. 展开更多
关键词 MIL-101(Cr) N-HEPTANE ISOMERIZATION phosphomolybdic acid CATALYSIS
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Molecularly imprinted sensor based on carboxylated carbon nanotubes/Keggin-type polyoxometalates nanocomposite for the detection of furazolidone
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作者 Yu-Lan Huang Bing Zhang +3 位作者 Yu-Lian Li Li Wang Le Dong Jian Li 《Tungsten》 EI CSCD 2024年第2期394-409,共16页
Due to its properties of mutagenic,teratogenic,and carcinogenic,the detection of furazolidone(FZD)in aquaculture is of great importance for food safety and human health.In this study,molecularly imprinted fi lms modif... Due to its properties of mutagenic,teratogenic,and carcinogenic,the detection of furazolidone(FZD)in aquaculture is of great importance for food safety and human health.In this study,molecularly imprinted fi lms modifi ed with carboxylated multi-walled carbon nanotube-phosphomolybdic acid composite were used to fabricate an electrochemical sensor for the determination of FZD.The nanocomposites were characterized using infrared spectroscopy,scanning electron microscopy,energy-dispersive X-ray spectroscopy,and X-ray diff raction.The electrochemical characteristics of the modifi ed electrodes were examined using electrochemical impedance spectroscopy,cyclic voltammetry,and diff erential pulse voltammetry.The sensor exhibited exceptional catalytic performance.The calibration curves were acquired in the concentration range of 6 nmol·L^(−1)to 0.6μmol·L^(−1),with a limit of detection of 3.38 nmol·L^(−1).Additionally,the sensor proved successful in recognizing FZD in shrimp samples with satisfactory recoveries and precision.The method provides a strategy to construct a molecularly imprinted electrochemical sensing platform using nanomaterials,which has great promise in the field of food safety. 展开更多
关键词 phosphomolybdate FURAZOLIDONE POLYOXOMETALATES Carboxylated multi-walled carbon nanotube Molecularly imprinted polymers Electrochemical sensor
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杂多酸/Zr-MOF-808复合催化剂的制备及催化性能研究
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作者 洪星悦 李珍英 +1 位作者 雷姣 张秋云 《辽宁化工》 CAS 2024年第9期1355-1358,共4页
通过水热法制备了锆基金属有机框架(Zr-MOF-808)固载磷钼酸(HPMo)复合催化剂,利用FTIR、XPS、SEM-EDS、N2吸附脱附等表征技术对其结构及形貌进行表征分析,并将其应用于催化油酸(OA)与甲醇的酯化反应。经过工艺优化后的最优酯化反应条件... 通过水热法制备了锆基金属有机框架(Zr-MOF-808)固载磷钼酸(HPMo)复合催化剂,利用FTIR、XPS、SEM-EDS、N2吸附脱附等表征技术对其结构及形貌进行表征分析,并将其应用于催化油酸(OA)与甲醇的酯化反应。经过工艺优化后的最优酯化反应条件为:反应时间为3 h、催化剂用量为0.15 g、反应温度为150℃、油酸与甲醇物质的量比为1∶20,在此条件下OA转化率达87.7%,且催化剂重复使用6次后HPMo/Zr-MOF-808仍保持较高活性。 展开更多
关键词 磷钼酸 金属有机框架 酯化反应 生物柴油
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SYNTHESIS AND CHARACTERIZATION OF HYBRID PROTON CONDUCTING MEMBRANES OF POLY(VINYL ALCOHOL) AND PHOSPHOMOLYBDIC ACID 被引量:1
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作者 Arfat Anis A.K. Banthia +1 位作者 S. Mondal A.K. Thakur 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2006年第5期449-456,共8页
Hybrid proton conducting membranes of poly(vinyl alcohol) (PVA) and phosphomolybdic acid (PMA) were prepared by solution casting method. The effect of PMA doping and PVA crosslinking density on the membrane prop... Hybrid proton conducting membranes of poly(vinyl alcohol) (PVA) and phosphomolybdic acid (PMA) were prepared by solution casting method. The effect of PMA doping and PVA crosslinking density on the membrane properties and proton conductivity were investigated. The crosslinking reaction between the hydroxyl group of PVA and the aldehyde group of glutaraldehyde (GA) was characterized by IR spectroscopy. Proton conductivity of the membranes increases with an increase in concentration of the doped PMA and also with an increase in crosslinking density of the membranes. Proton conductivity results indicate that a significant amount of PMA was maintained in the membranes even after several hours of immersion in water. A maximum conductivity of 0.0101 S cm^-1 was obtained for the membrane with 33.3 wt% PMA and crosslinking density of 5.825 mol%. X-ray diffraction studies were carried out to investigate the influence of PMA doping and crosslinking density on the nature of the membranes. These properties make them very good candidates for polymer electrolyte membranes for direct methanol fuel cell application. 展开更多
关键词 Polymer electrolyte membranes Proton conductor phosphomolybdic acid Crosslinked PVA membranes.
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Oxidative Desulfurization of Model Sulfur Compound by Potassium Ferrate in the Presence of Phosphomolybdic Acid Catalyst 被引量:1
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作者 Liu Yanxiu Song Hua Zhang Wenchao 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2013年第1期61-65,共5页
In this work, the removal of thiophene from simulated oil has been studied by using the adsorption, extraction and oxidation/adsorption methods, respectively. In the adsorptive desulfurization process, different comme... In this work, the removal of thiophene from simulated oil has been studied by using the adsorption, extraction and oxidation/adsorption methods, respectively. In the adsorptive desulfurization process, different commercial adsorbents were used to eliminate thiophene at ambient pressure and mild temperature, and the results showed that carbon powder had the best adsorption ability. In the extractive desulfurization process, the best desulfurization result was obtained when DMF is used. In the oxidative/adsorptive desulfurization procedure using synthesized potassium ferrate as the oxidant and phosphomolybdic acid solution as the catalyst, thiophene was oxidized and removed from hydrocarbons in combination with active carbon adsorption, and the residual sulfur content of simulated oil could be reduced to 15.3mg/L from the original level of 200mg/L, with the desulfurization rate reaching 92.3%. 展开更多
关键词 oxidative desulfurization phosphomolybdic acid potassium ferrate
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