天然气化工（C1化学与化工）
天然氣化工（C1化學與化工）
천연기화공（C1화학여화공）
Natural Gas Chemical Industry
2015年
3期
1-3,9
,共4页
沈普霖%罗漫%肖文德
瀋普霖%囉漫%肖文德
침보림%라만%초문덕
蛋壳型分布%钯%氧化铝%CO偶联%草酸二甲酯
蛋殼型分佈%鈀%氧化鋁%CO偶聯%草痠二甲酯
단각형분포%파%양화려%CO우련%초산이갑지
egg-shelled distribution%palladium%alumina%carbon monoxide coupling%dimethyl oxalate
在平均孔径为2.799×103nm的α-Al2O3载体上负载金属钯，制备贵金属负载型催化剂Pd/α-Al2O3。调节前驱体浸渍液的pH，在pH为1.67时，得到分散在整个载体中的均匀分布Pd/α-Al2O3催化剂；在pH为12.25时，可以制备只负载在氧化铝载体表面以下约40μm的蛋壳型分布Pd/α-Al2O3催化剂。催化表征结果显示不同分布的催化剂钯晶粒的粒径均在2nm~3nm左右，属于高度分散状态。在无梯度反应器中，对CO偶联制备草酸二甲酯（DMO）这一反应进行考评，得出均匀型分布催化剂较蛋壳型结构活性更优的结论。
在平均孔徑為2.799×103nm的α-Al2O3載體上負載金屬鈀，製備貴金屬負載型催化劑Pd/α-Al2O3。調節前驅體浸漬液的pH，在pH為1.67時，得到分散在整箇載體中的均勻分佈Pd/α-Al2O3催化劑；在pH為12.25時，可以製備隻負載在氧化鋁載體錶麵以下約40μm的蛋殼型分佈Pd/α-Al2O3催化劑。催化錶徵結果顯示不同分佈的催化劑鈀晶粒的粒徑均在2nm~3nm左右，屬于高度分散狀態。在無梯度反應器中，對CO偶聯製備草痠二甲酯（DMO）這一反應進行攷評，得齣均勻型分佈催化劑較蛋殼型結構活性更優的結論。
재평균공경위2.799×103nm적α-Al2O3재체상부재금속파，제비귀금속부재형최화제Pd/α-Al2O3。조절전구체침지액적pH，재pH위1.67시，득도분산재정개재체중적균균분포Pd/α-Al2O3최화제；재pH위12.25시，가이제비지부재재양화려재체표면이하약40μm적단각형분포Pd/α-Al2O3최화제。최화표정결과현시불동분포적최화제파정립적립경균재2nm~3nm좌우，속우고도분산상태。재무제도반응기중，대CO우련제비초산이갑지（DMO）저일반응진행고평，득출균균형분포최화제교단각형결구활성경우적결론。
Supported noble metal catalyst Pd/α-Al2O3 was prepared with the α-alumina possessing an average pore size of 2.799 ×103nm as support. The uniform Pd distribution and the egg-shelled Pd distribution with a depth of 40μm were obtained by controlling the pH of precursor impregnation solution at 1.67 and 12.25, respectively. Catalyst characterization results showed that the palladium particles size was about 2 nm to 3nm, which were in a highly dispersed state. These catalysts were evaluated through the synthesis of dimethyl oxalate (DMO) by CO coupling method in a no-gradient reactor. It was shown that Pd/α-Al2O3 with uniform Pd distribution generally had higher catalytic activity than the egg-shelled one.
