第
31
卷第
4
期
南京工业大学学报(自然科学版)
2009
年
7
月
JOURNAL
OF
NANJING
UNIVERSITY
OF
TECHNOLOGY
(Natural Science Edition)
Vo
1.
31
No.4
July
2009
doi:
10.
3969/j. issn.
1671
-7627.2009.04.007
稀土改性
HZSM-5
催化乙醇脱水制乙烯
成源海胡耀池
2
李
慧
2
胡
安交
2
张红漫
l
(1.南京工业大学理学院,江苏南京
210009
;
2.
南京工业大学材料化学工程国家重点实验室,江苏南京
210009)
摘
要:采用浸渍法制备
La
、
Ce
、
Sm
、
Eu
等稀土
(RE)
金属改性的
HZSM
-5
分子筛催化剂(
RE/HZSM -
5)
,考察它
们在乙醇脱
7]<..
制乙烯反应中的催化性能.通过
X
射线衍射
(XRD)
、
N
2
吸附-脱附
(BET)
和氨程序升温脱附
(NH
3
-
TPD)
等手段对其物化性能进行表征,并讨论反应温度对
LalHZSM
-5
催化性能的影响结果表明:少量稀土引入不
破坏
HZSM-5
分子筛的骨架结构,只对表面酸性产生了较大的影响;表面酸量决定
RE/HZSM
-5
催化乙醇脱水制
乙烯的性能,政量的增大有利于乙醇转化率的提高;在不同稀土改性的催化剂中,
2%
LalHZSM -
5
的催化性能最
佳,在反应温度
240
"c、
559
毛原料乙醇、进料质量空速
(WHSV)2.5
h-'
的条件下,乙醇转化率和乙烯选择性分别达到
99.3%
和
98.6%
关键词:
HZSM
-5;
稀土;乙醇脱水;乙烯
中图分类号:
TQ22
1.
21; 0643.3
文献标志码
:A
文章编号:
1671
-7627(2009)04
-0032
-04
Catalytic dehydration of ethanol to ethylene on HZSM
-5
zeolites
modified by
rare
earth
CHENG
Yuan-hai
1
,
HU
Yao-chi
2
,
LI
Hu?
,
HU
Yi
2
,
ZHANG
Hong-man
1
(1.
College
of
Sciences ,
Nanjing
University
of
Technology
,
Nanjing
210009 , China;
2. State
Key
Laboratory
of
Materials-Oriented
Chemical
Engineering ,
Nanjing
University
of
Technology
,
Nanjing
210009 , China)
Abstract:
Rare
earth
modified HZSM-5 catalysts
(RE/HZSM
-5)
were
prepared
by
an
impregnation
meth-
od. Catalytic performances
of
RE/HZSM-5
for dehydration of
ethanol
to
ethylene
were investigated
and
different reaction
temperatures
were
discussed
on L
a/
HZSM -5.
And
their
physical
and
chemical
proper-
ties were
characterized
by X-ray diffraction
(XRD)
, nitrogen adsorption-desorption
(BET)
and
tempera
仕
-
tu
盯
re
prog
♂
rammed
desor
甲
p
严
tion
of ammo
would not destroy
the
framework
s
挝
tructure
of HZSM-5 while
the
surface acidity was greatly
changed.
The
activity for
ethanol
dehydration was
dependent
on
acid
sites on
the
catalyst surface ,
and
the
increasing
of
acid
quantity would improve
the
conversion of ethanol.
The
best
catalytic performance was
obtained
on
L
a/
HZSM-5.
Under
the
optimized reaction conditions
of240
OC
,
55%
ethanol
concentration ,
and
weight
h
Ol川
y
space
velocity
(WHSV)
2. 5 h
-1
,
the
ethanol
conversion
and
the
ethylene
selectivity of 2 % L
a/
HZSM-5 were
up
to 99.
3%
and
98.
6%.
Key
words:
HZSM-5;
rare
earth;
ethanol
dehydration;
ethylene
收稿日期
:2009
-03
-23
基金项目:国家高技术研究发展计划
(863
计划)资助项目
(2006AA020101)
;国家"十一五"科技支撑计划重点资助项目(
2006BAE02B04)
侍者简介.成源海(
1984
一)
,男,江苏苏州人,硕士生,主要研究方向为工业催化;张红漫(联系人)
,副教授,
E-mail:
biotech@nju
t.
edu.cn