Table 1

Characteristics of physical modification

Muffle furnace-heating Water evaporation and smoothing the channel and hole Ammonia Simple and convenient Power-wasting;
inefficient
Ali et al. (2014)
Microwave oven-heating Elimination of impurities from channel; increase hole diameter;
uniform pore size
Ammonia Heating time saving;
good penetration; high efficiency
Uneven heating because of moisture in the zeolite Gracia et al. (2013), Bagheri et al. (2015)
Ultrasonic Elimination of impurities from channel;
increase surface area
Ammonia Good penetration; removal of impurities from channel Inefficient;
always combined with other methods
Zielinski et al. (2015)
Muffle furnace-heating Water evaporation and smoothing the channel and hole Ammonia Simple and convenient Power-wasting;
inefficient
Ali et al. (2014)
Microwave oven-heating Elimination of impurities from channel; increase hole diameter;
uniform pore size
Ammonia Heating time saving;
good penetration; high efficiency
Uneven heating because of moisture in the zeolite Gracia et al. (2013), Bagheri et al. (2015)
Ultrasonic Elimination of impurities from channel;
increase surface area
Ammonia Good penetration; removal of impurities from channel Inefficient;
always combined with other methods
Zielinski et al. (2015)
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