Synthesis of ketals and acetals from 2,2bis(hydroxymethyl)propane1,3diol with aldehydes and ketones was catalysed by phosphotungstic acid supported on active carbon(HPW/C),and the factors influencing the yield w...Synthesis of ketals and acetals from 2,2bis(hydroxymethyl)propane1,3diol with aldehydes and ketones was catalysed by phosphotungstic acid supported on active carbon(HPW/C),and the factors influencing the yield were investigated.It is show that HPW/C was an excellent catalyst,and it was stabtilitive and reusable.The products were characterized by 1H NMR,IR and elemental analysis.展开更多
以钛酸丁酯和硝酸镧为原料,采用溶胶-凝胶法制备了纯的和La掺杂活性炭负载TiO2催化剂,用XRD、UV-V is漫反射光谱和扫描电镜等测试技术对该催化剂的晶型和形貌进行了表征,并考察了La含量和焙烧温度对TiO2/AC催化剂的性质及光催化分解亚...以钛酸丁酯和硝酸镧为原料,采用溶胶-凝胶法制备了纯的和La掺杂活性炭负载TiO2催化剂,用XRD、UV-V is漫反射光谱和扫描电镜等测试技术对该催化剂的晶型和形貌进行了表征,并考察了La含量和焙烧温度对TiO2/AC催化剂的性质及光催化分解亚甲基蓝活性的影响。结果表明,La掺杂不仅抑制了TiO2由锐钛矿相向金红石相的转变,而且使TiO2的光响应范围向可见光区拓展。当掺杂摩尔分数为0.30%的La,可见光照射120 m in时,La-TiO2/AC催化剂的光催化分解率可达87%。展开更多
文摘Synthesis of ketals and acetals from 2,2bis(hydroxymethyl)propane1,3diol with aldehydes and ketones was catalysed by phosphotungstic acid supported on active carbon(HPW/C),and the factors influencing the yield were investigated.It is show that HPW/C was an excellent catalyst,and it was stabtilitive and reusable.The products were characterized by 1H NMR,IR and elemental analysis.
文摘以钛酸丁酯和硝酸镧为原料,采用溶胶-凝胶法制备了纯的和La掺杂活性炭负载TiO2催化剂,用XRD、UV-V is漫反射光谱和扫描电镜等测试技术对该催化剂的晶型和形貌进行了表征,并考察了La含量和焙烧温度对TiO2/AC催化剂的性质及光催化分解亚甲基蓝活性的影响。结果表明,La掺杂不仅抑制了TiO2由锐钛矿相向金红石相的转变,而且使TiO2的光响应范围向可见光区拓展。当掺杂摩尔分数为0.30%的La,可见光照射120 m in时,La-TiO2/AC催化剂的光催化分解率可达87%。
文摘用浸渍法在活性炭上负载铈制备催化剂(Ce/AC),并用XRD和SEM对其进行了表征,考察了Ce负载量、催化剂投加量对Ce/AC催化臭氧氧化降解邻苯二甲酸二甲酯(DMP)的影响.结果表明,Ce/AC催化臭氧氧化降解DMP的优化参数是催化剂投加量1.5 g/L,Ce的负载量0.2%.在优化条件下,Ce/AC加入有利于催化臭氧氧化DMP过程中TOC的去除.质量浓度为30 mg/L(pH=5.0)的DMP反应60 m in后的TOC去除率由以AC为催化剂的48%提高到68%,而单独臭氧氧化过程中TOC去除率仅有22%.
