CAJ | 학술논문

采用共沉淀沉积法制备了一种适用于富碳合成气一步法合成二甲醚(DME)的高活性催化剂C207-HZSM-5。考察了催化剂配比、还原条件、反应温度等对催化剂性能的影响,并采用程度升温还原(TPR)方法及XRD表征,对催化剂的还原性能及催化剂氧化态、还原态、反应后的物相结构进行了分析。结果表明,还原时,低升温速率有利于催化剂活性的提高。在p=3MPa、T=280℃、空速为3000mL/(g·h)条件下,CO转化率为66.03%,DME收率为45.5%,接近其热力学平衡值。结合活性评价结果及不同还原温度下的XRD结果得出,Cu+是催化剂的主要活性物种。TPR结果表明,还原分两步进行,即165℃处的Cu2+还原至Cu+过程,和175℃处的少量的Cu+还原至Cu0过程。
채용공침정침적법제비료일충괄용우부탄합성기일보법합성이갑미(DME)적고활성최화제C207-HZSM-5。고찰료최화제배비、환원조건、반응온도등대최화제성능적영향,병채용정도승온환원(TPR)방법급XRD표정,대최화제적환원성능급최화제양화태、환원태、반응후적물상결구진행료분석。결과표명,환원시,저승온속솔유리우최화제활성적제고。재p=3MPa、T=280℃、공속위3000mL/(g·h)조건하,CO전화솔위66.03%,DME수솔위45.5%,접근기열역학평형치。결합활성평개결과급불동환원온도하적XRD결과득출,Cu+시최화제적주요활성물충。TPR결과표명,환원분량보진행,즉165℃처적Cu2+환원지Cu+과정,화175℃처적소량적Cu+환원지Cu0과정。
Catalyst C207-HZSM-5 prepared by coprecipitation deposition showed high catalytic activity for dimethyl ether synthesis from syngas rich in carbon monoxide. The effect of the ratio of C207 to HZSM-5 by weight, reduction conditions and reaction conditions, on the catalytic activity were investigated. In addition, the reduction and the crystal structures of catalysts in oxidized, reduced and used states were scanned by temperature-programmed reduction(TPR) and XRD. The results show that the conversion of CO a...