为探讨1.4%甲磺·五氟·异噁颗粒剂在移栽稻田的应用前景,2014—2015年开展田间应用技术研究。结果表明,施药后56 d,1.4%甲磺·五氟·异噁颗粒剂231~588 g a.i./hm^2对移栽稻田杂草稗[Echinochloacrusgali(L.)Beauv.]...为探讨1.4%甲磺·五氟·异噁颗粒剂在移栽稻田的应用前景,2014—2015年开展田间应用技术研究。结果表明,施药后56 d,1.4%甲磺·五氟·异噁颗粒剂231~588 g a.i./hm^2对移栽稻田杂草稗[Echinochloacrusgali(L.)Beauv.]、异型莎草(Cyperus difformis L.)、水苋菜属杂草(Ammannia spp.)和鸭舌草[Monochoria vaginali(Burm.f.)Presl ex Kunth]的株数防效分别为95.40%~100.00%、94.30%~100.00%、92.96%~100.00%和96.11%~100.00%,总草株数防效达94.75%~100.00%,总草鲜质量防效达96.24%~100.00%;总草株数防效和总草鲜质量防效均显著优于各个对照药剂。在推荐剂量231~294 g a.i./hm^2下1.4%甲磺·五氟·异噁颗粒剂对水稻茎孽数、株高、地上部鲜质量、根长和地下部鲜质量等生长指标无不良影响。水稻移栽后5~7 d一次撒施即可有效解决移栽稻田整个生长季杂草危害,应用推广前景广阔。展开更多
The solvent‐free oxidation of benzyl alcohol was studied using supported Pd‐Ni bimetallic nanoparticles.Compared with monometallic Pd,the addition of Ni to Pd was found to be effective in suppressing the nondesired ...The solvent‐free oxidation of benzyl alcohol was studied using supported Pd‐Ni bimetallic nanoparticles.Compared with monometallic Pd,the addition of Ni to Pd was found to be effective in suppressing the nondesired product toluene,thereby enhancing the selectivity towards benzaldehyde.This result was attributed to a dual effect of Ni addition:the weakening of dissociative adsorption of benzyl alcohol and the promotion of oxygen species involved in the oxidation pathway.展开更多
This study reports the synthesis of size-controlled Fe-MFI （Fe-substituted zeolites with the MFI topology） and their catalytic performances for DTO （dimethyl ether-to-olefins） reaction. The amount of HC1 and aging...This study reports the synthesis of size-controlled Fe-MFI （Fe-substituted zeolites with the MFI topology） and their catalytic performances for DTO （dimethyl ether-to-olefins） reaction. The amount of HC1 and aging temperature were decisive factors to control the particle size of Fe-MFI in the range of 50 nm to 600 nm. The introduction of Fe3＋ ions into the zeolitic framework was confirmed by UV （ultraviolet）-visible spectroscopy. In addition, it was observed that the strength of acid site in prepared Fe-MFI was weaker than that of commercial ZSM-5. With decrease in the particle size, the amount of deposited coke decreased so that the catalyst life for the DTO reaction was well promoted. The present catalysts showed the higher light-olefin selectivity （C2= ＋ C3= ＋ C4=） than commercial ZSM-5 catalysts mainly due to the suppression of the formation of paraffins; however, the Fe-MFI catalysts were deactivated rapidly because of their low activity for the cracking of alkenes.展开更多
文摘为探讨1.4%甲磺·五氟·异噁颗粒剂在移栽稻田的应用前景,2014—2015年开展田间应用技术研究。结果表明,施药后56 d,1.4%甲磺·五氟·异噁颗粒剂231~588 g a.i./hm^2对移栽稻田杂草稗[Echinochloacrusgali(L.)Beauv.]、异型莎草(Cyperus difformis L.)、水苋菜属杂草(Ammannia spp.)和鸭舌草[Monochoria vaginali(Burm.f.)Presl ex Kunth]的株数防效分别为95.40%~100.00%、94.30%~100.00%、92.96%~100.00%和96.11%~100.00%,总草株数防效达94.75%~100.00%,总草鲜质量防效达96.24%~100.00%;总草株数防效和总草鲜质量防效均显著优于各个对照药剂。在推荐剂量231~294 g a.i./hm^2下1.4%甲磺·五氟·异噁颗粒剂对水稻茎孽数、株高、地上部鲜质量、根长和地下部鲜质量等生长指标无不良影响。水稻移栽后5~7 d一次撒施即可有效解决移栽稻田整个生长季杂草危害,应用推广前景广阔。
基金supported by National Natural Science Foundation of China(21271153,21373181,21222307,U1402233)Major Research Plan of National Natural Science Foundation of China(91545113)the Fundamental Research Funds for the Central Universities(2014XZZX003-02)~~
文摘The solvent‐free oxidation of benzyl alcohol was studied using supported Pd‐Ni bimetallic nanoparticles.Compared with monometallic Pd,the addition of Ni to Pd was found to be effective in suppressing the nondesired product toluene,thereby enhancing the selectivity towards benzaldehyde.This result was attributed to a dual effect of Ni addition:the weakening of dissociative adsorption of benzyl alcohol and the promotion of oxygen species involved in the oxidation pathway.
文摘This study reports the synthesis of size-controlled Fe-MFI （Fe-substituted zeolites with the MFI topology） and their catalytic performances for DTO （dimethyl ether-to-olefins） reaction. The amount of HC1 and aging temperature were decisive factors to control the particle size of Fe-MFI in the range of 50 nm to 600 nm. The introduction of Fe3＋ ions into the zeolitic framework was confirmed by UV （ultraviolet）-visible spectroscopy. In addition, it was observed that the strength of acid site in prepared Fe-MFI was weaker than that of commercial ZSM-5. With decrease in the particle size, the amount of deposited coke decreased so that the catalyst life for the DTO reaction was well promoted. The present catalysts showed the higher light-olefin selectivity （C2= ＋ C3= ＋ C4=） than commercial ZSM-5 catalysts mainly due to the suppression of the formation of paraffins; however, the Fe-MFI catalysts were deactivated rapidly because of their low activity for the cracking of alkenes.
