洁净煤技术
潔淨煤技術
길정매기술
CLEAN COAL TECHNOLOGY
2014年
6期
104-108,31
,共6页
路贵增%雷泽%赵昊鹰%宋文婉%韩敏芳
路貴增%雷澤%趙昊鷹%宋文婉%韓敏芳
로귀증%뢰택%조호응%송문완%한민방
堇青石蜂窝陶瓷%催化剂载体%酸处理%整体式催化剂%甲烷催化燃烧
堇青石蜂窩陶瓷%催化劑載體%痠處理%整體式催化劑%甲烷催化燃燒
근청석봉와도자%최화제재체%산처리%정체식최화제%갑완최화연소
cordierite honeycomb%catalyst support%acid treatment%monolithic catalyst%methane catalytic combustion
采用不同浓度硝酸和草酸溶液,对堇青石蜂窝陶瓷载体进行预处理,考察了酸处理对载体失重率、吸水率及压缩强度的影响。采用催化剂粉体浆料涂覆法,制备了堇青石蜂窝陶瓷负载锰酸锶镧基 La0.8 Sr0.2 Mn0.4 Al0.4 Zn0.2 O3-δ(LSMAZ)整体式催化剂,运用 X 射线衍射(XRD)、扫描电镜(SEM)等手段对催化剂进行表征,并在管式反应器上进行甲烷催化燃烧活性测试。结果表明,酸处理能增大载体比表面积和吸水率;相同条件下草酸对载体的侵蚀效果优于硝酸;提高草酸浓度能增强侵蚀效果,但过高浓度的酸处理会使载体压缩强度过小而无法应用。经1050℃煅烧5 h 后,所制备的整体式催化剂具有适宜的脱落率,无明显载体-LSAMZ 界面反应,并具有最高的甲烷燃烧催化活性。
採用不同濃度硝痠和草痠溶液,對堇青石蜂窩陶瓷載體進行預處理,攷察瞭痠處理對載體失重率、吸水率及壓縮彊度的影響。採用催化劑粉體漿料塗覆法,製備瞭堇青石蜂窩陶瓷負載錳痠鍶鑭基 La0.8 Sr0.2 Mn0.4 Al0.4 Zn0.2 O3-δ(LSMAZ)整體式催化劑,運用 X 射線衍射(XRD)、掃描電鏡(SEM)等手段對催化劑進行錶徵,併在管式反應器上進行甲烷催化燃燒活性測試。結果錶明,痠處理能增大載體比錶麵積和吸水率;相同條件下草痠對載體的侵蝕效果優于硝痠;提高草痠濃度能增彊侵蝕效果,但過高濃度的痠處理會使載體壓縮彊度過小而無法應用。經1050℃煅燒5 h 後,所製備的整體式催化劑具有適宜的脫落率,無明顯載體-LSAMZ 界麵反應,併具有最高的甲烷燃燒催化活性。
채용불동농도초산화초산용액,대근청석봉와도자재체진행예처리,고찰료산처리대재체실중솔、흡수솔급압축강도적영향。채용최화제분체장료도복법,제비료근청석봉와도자부재맹산송란기 La0.8 Sr0.2 Mn0.4 Al0.4 Zn0.2 O3-δ(LSMAZ)정체식최화제,운용 X 사선연사(XRD)、소묘전경(SEM)등수단대최화제진행표정,병재관식반응기상진행갑완최화연소활성측시。결과표명,산처리능증대재체비표면적화흡수솔;상동조건하초산대재체적침식효과우우초산;제고초산농도능증강침식효과,단과고농도적산처리회사재체압축강도과소이무법응용。경1050℃단소5 h 후,소제비적정체식최화제구유괄의적탈락솔,무명현재체-LSAMZ 계면반응,병구유최고적갑완연소최화활성。
Cordierite Honeycomb ceramic supporters were treated by different concentrations of oxalic acid and nitric acid respectively.The effects of acid treatment on weightlessness rate,water absorption rate and compressive strength of the supporters were investigated.Cordier-ite Honeycomb ceramics supported Lanthanum strontium manganite based La0.8 Sr0.2 Mn0.4 Al0.4 Zn0.2 O3-δ(LSMAZ) catalysts were prepared by a catalyst powder slurry coating method.The resultant monolithic catalysts were characterized by X-ray powder diffraction (XRD),field emission scanning electron microscopy (FE-SEM).The catalytic performance for methane combustion was conducted in a tubular reactor. The results showed that acid treatment increased the specific surface area and water absorption of the supporters.Under the same condition, the erosive effect of oxalic acid on the supporters was better than that of nitric acid.The erosive effect was promoted with the increase of the oxalic acid concentration.However,the excessive concentration of acid weakened the compressive strength of the supporters,which were not used anymore.By calcining at 1050 ℃ for 5 hours,the resultant monolithic catalyst possessed moderate failure rate and insignificant inter-face reaction between support and LSMAZ,therefore,it also gave the highest catalytic activity for methane combustion.