Assertion: combustion | /r/HasProperty | difficult
Facets:
value: due to a lower laminar burning velocity
type: CAUSE
value: due to high heat of vaporization
type: CAUSE
value: very
type: DEGREE
value: due to a narrow flammability range
type: CAUSE
value: due to high auto-ignition temperature
type: CAUSE
Source sentences:
text: The combustion of ammonia in air is very difficult in the absence of a catalyst (such as platinum gauze or warm chromium(III) oxide), due to the relatively low heat of combustion, a lower laminar burning velocity, high auto-ignition temperature, high heat of vaporization, and a narrow flammability range.