高校化学工程学报
高校化學工程學報
고교화학공정학보
JOURNAL OF CHEMICAL ENGINEERING OF CHINESE UNIVERSITIES
2013年
4期
615-621
,共7页
周志伟%秦娟%王巍%武文良
週誌偉%秦娟%王巍%武文良
주지위%진연%왕외%무문량
金刚烷%异构化%磷钨酸%介孔 Hβ 沸石
金剛烷%異構化%燐鎢痠%介孔 Hβ 沸石
금강완%이구화%린오산%개공 Hβ 비석
adamantane%isomerization%12-tungstophosphoric acid%mesoporous Hβzeolite
采用NaOH溶液对含有模板剂氢氧化四乙基铵(TEAOH)的 Hβ沸石进行脱硅处理,制备了介孔 Hβ沸石;采用过量液相浸渍法制备了一系列介孔 Hβ沸石负载磷钨酸(PW)催化剂,考察了其在桥式四氢双环戊二烯(endo-TCD)异构化制备金刚烷反应中的催化性能;并采用 XRD、液 N2吸附和 NH3-TPD 对催化剂的物化性质进行了表征。表征结果表明,当 PW 酸负载量达到30%时,其仍能在介孔Hβ沸石表面高度分散,且对应的催化剂的酸量最大。采用30%PW/介孔 Hβ沸石为催化剂,在反应温度240℃,w(catalyst)/w(endo-TCD)=0.6,反应时间为5 h 时,endo-TCD的转化率达到99.4%;与 PW/Hβ沸石相比,PW/介孔 Hβ沸石由于其存在部分介孔,金刚烷的收率提高至原来的1.46倍,原来的22.4%提高至32.7%;且催化剂再生能力良好,重复使用6次后,金刚烷收率还高达28.7%。
採用NaOH溶液對含有模闆劑氫氧化四乙基銨(TEAOH)的 Hβ沸石進行脫硅處理,製備瞭介孔 Hβ沸石;採用過量液相浸漬法製備瞭一繫列介孔 Hβ沸石負載燐鎢痠(PW)催化劑,攷察瞭其在橋式四氫雙環戊二烯(endo-TCD)異構化製備金剛烷反應中的催化性能;併採用 XRD、液 N2吸附和 NH3-TPD 對催化劑的物化性質進行瞭錶徵。錶徵結果錶明,噹 PW 痠負載量達到30%時,其仍能在介孔Hβ沸石錶麵高度分散,且對應的催化劑的痠量最大。採用30%PW/介孔 Hβ沸石為催化劑,在反應溫度240℃,w(catalyst)/w(endo-TCD)=0.6,反應時間為5 h 時,endo-TCD的轉化率達到99.4%;與 PW/Hβ沸石相比,PW/介孔 Hβ沸石由于其存在部分介孔,金剛烷的收率提高至原來的1.46倍,原來的22.4%提高至32.7%;且催化劑再生能力良好,重複使用6次後,金剛烷收率還高達28.7%。
채용NaOH용액대함유모판제경양화사을기안(TEAOH)적 Hβ비석진행탈규처리,제비료개공 Hβ비석;채용과량액상침지법제비료일계렬개공 Hβ비석부재린오산(PW)최화제,고찰료기재교식사경쌍배무이희(endo-TCD)이구화제비금강완반응중적최화성능;병채용 XRD、액 N2흡부화 NH3-TPD 대최화제적물화성질진행료표정。표정결과표명,당 PW 산부재량체도30%시,기잉능재개공Hβ비석표면고도분산,차대응적최화제적산량최대。채용30%PW/개공 Hβ비석위최화제,재반응온도240℃,w(catalyst)/w(endo-TCD)=0.6,반응시간위5 h 시,endo-TCD적전화솔체도99.4%;여 PW/Hβ비석상비,PW/개공 Hβ비석유우기존재부분개공,금강완적수솔제고지원래적1.46배,원래적22.4%제고지32.7%;차최화제재생능력량호,중복사용6차후,금강완수솔환고체28.7%。
Desilicated mesoporous Hβ zeolite was prepared through treating Hβ zeolite including template tetraethylammonium hydroxide (TEAOH) with NaOH aqueous solution. 12-Tungstophosphoric acid (PW) was immobilized on the desilicated mesoporous Hβzeolite at room temperature to form the PW/meso-Hβcatalysts. The physical and chemical properties of the PW/meso-Hβ catalysts were characterized by X-ray diffraction (XRD), liquid N2 adsorption-desorption and temperature programmed desorption of ammonia (NH3-TPD), respectively; and the catalytic performances of the prepared PW/meso-Hβ catalysts were investigated by catalyzing the isomerization reaction of endo-tetrahydrodicyclotadiene (endo-TCD) to form adamantane (ADH) in a 100 mL batch stainless-steel autoclave with stirring. The results show that the loaded PW could still be highly dispersed on the surface of the desilicated mesoporous Hβzeolite when the PW loading is 30%, and the 30%PW/meso-Hβcatalyst has the largest acid amount. When using 30%PW/meso-Hβzeolite as catalyst, 99.4%conversion of endo-TCD can be obtained under the following conditions: reaction temperature of 240℃, the catalyst to endo-TCD mass ratio of 0.6 and reaction time of 5 h. In comparison with PW/Hβcatalyst, the yield of ADH increases from 22.4%to 32.7%because of the presence of mesopores in the desilicated Hβzeolite. The catalytic activity of used catalyst can be recovered and the yield of ADH can still reach 28.7%after 6 times reuse.