微波辐照毛竹梢制备活性炭

以毛竹梢为原料,研究用微波辐照化学法制备活性炭的可行性。探讨了在微波功率900W条件下,微波辐射氯化锌法和磷酸法中各因素对产品得率、亚甲基蓝脱色力的影响。得到了微波辐射氯化锌法制备活性炭的最佳工艺:ZnCl2溶液质量分数50%,料液比1∶5(质量比,下同),辐照时间25min,浸渍时间24h,活性炭得率为46.3%,亚甲基蓝脱色力12.7mL/0.1g,是国家一级品标准(GB/T13803.2-1999,下同)的1.41倍。微波辐射磷酸法制备活性炭的最佳工艺:磷酸溶液质量分数40%,料液比1∶5,辐照时间20min,浸渍时间24h,活性炭得率为50.5%,亚甲基蓝脱色力11.0mL/0.1g,是国家一级品标准的1.22倍。

操作条件对PBI/H_3PO_4体系高温PEMFC的性能影响

全面研究了PBI/H3PO4体系高温质子交换膜燃料电池(PEMFC)的操作性能,研究了温度、压力、阴极气体成分(空气/氧气)对电池稳态操作性能的影响,同时,测试了电池的变压变温和变负载操作曲线,并且运用电化学交流阻抗谱的方法解释了操作条件对电池性能影响的原因,同时应用薄膜旋转圆盘电极技术初步研究了氧还原反应在两种不同的反应界面(Pt/C-PBI/H3PO4和Pt/C-Nafion/H2SO4)的差别。

H_3PO_4活化法制备污泥基活性炭吸附去除Pb^(2+)研究

以养殖废水生化处理后的剩余污泥为原料,H_3PO_4为活化剂制备污泥活性炭.将其用于对Pb^(2+)废水处理,结果表明,用H_3PO_4化学活化法在550°C活化60min时制备出污泥活性炭20mg,对pH=5.5,5mg/L的Pb^(2+)溶液、吸附80min后,吸附去除率可达98.7%:污泥活性炭对Pb^(2+)废水的吸附规律符合Langmuir吸附等温模型,饱和吸附量为42.9mg/g.

Catalytic Synthesis of 3,3,4—Trimethyl—4—Penten—2—one over Solid—Supported H3PO4

3,3,4-Trimethyl-4-penten-2-one has been synthesized by the acylation of 2,3-dimethyl-2-butene with acetic anhydride in the presence of soild-supported H3PO4.By comparison of the acylation reactions of 2,3-dimethyl-2-butene with acetic anhydride over various soilds-supported H3PO4,it was found that K10 clay,silicagel,HY zeolite and HMordenite were good supports.The results obtined indicate that the soild-supported small amounts of H3PO4 possessed higher catalytic activities,For obatining a higher yield of 3,3,4-trimethyl-4-penten-2-one different supports required different modification methods.