丙烯水合醚化催化剂上焦炭前身物的表征

CHARACTERIZATION OF COKE PRECURSOR ON SURFACE OF PROPENE HYDRATION ETHERIFICATION CATALYST

采用热重、红外、高温模拟蒸馏和质谱等分析手段 ,对丙烯水合醚化失活催化剂上的焦炭前身物进行了表征。焦炭前身物主要是沸程范围在 2 0 0℃～ 4 0 0℃的长链饱和烃类化合物 ,四氯化碳洗液和二氯甲烷萃取液的红外和质谱分析均表明 ,焦炭前身物中没有烯烃和芳烃类化合物存在。β沸石催化剂具有一定的氢转移反应活性 ,由丙烯聚合生成的聚合烯烃进一步与焦炭前身物通过氢转移反应生成烷烃和焦炭。

Themolecularstructuresofcokeprecursordepositedonthesurfaceofpropenehydrationetherificationaged catalystwereanalysedbymeansofvariouscharacterizationapproaches ,includingTG ,IR ,MSandhightemperature simullatingdistillation Itisfoundthatthecokeprecursorwasmainlylong chainparaffins Neitheraromaticsnorpoly merizedolefineswasfoundinthecokeprecursor Thetotalamountofthecokeprecursordepositedonthesurfaceof theagedcatalystwas 11% ,80 %ofwhichwasinboilingrangeof 2 0 0℃～ 4 0 0℃ βzeolitecatalysthashydrogen transferactivity Polymerizedolefinsformedbypropenepolymerizationcanreactwithcokeprecursortoformcokeand alkanes Thecokeformedbyhydrogentransferreactioncannotbedissolvedbytetrachloromethaneorextractedbydi chloromethane