Isobutane alkylation with 2-butene to produce high-quality gasoline was catalyzed by

N

-methylacetamide (NMA)-AlCl

3

based ionic liquid (IL) analog with a NMA/AlCl

3

molar ratio of 0.75 and CuCl modification

which was marked as CuCl-modified 0.75NMA-1.0AlCl

3

. The long-term experiment was carried out in the autoclave operated in continuous mode to investigate the distribution of alkylate under different experimental nodes. The result indicated that the long-term alkylation was divided into three stages:rising

stable

and descending regions. C8 selectivity and molar ratio of trimethylpentanes (TMPs) to dimethylhexanes (DMHs) reached the highest level in the stable region

and research octane number (RON) of alkylate was as high as 97. Anionic Al species ([Al

2

Cl

7

]

-

[AlCuCl

5

]

-

) and cationic Al species ([AlCl

2

L

]

+

) from IL analog as two active Lewis acidic species played a catalytic role in the long-term alkylation

whereas the neutral Al species did not participate into the alkylation. Moreover

the structure of CuCl-modified 0.75NMA-1.0AlCl

3

was destroyed after the deactivation

and CuCl was enriched in the CD

2

Cl

2

-insoluble substance

resulting in a decreasing TMP/DMH ratio. The catalytic lifetime of IL analog was similar with CuCl-modified 0.55Et

3

NHCl-1.0AlCl

3

IL

but IL analog had a lower

cost.